AMETEK ASD Series - Manual (Page 64)

Programming: Digital Interface Control Sorensen ASD Series
4-6 M551177-01 Rev A
4.3.4 DEFAULT REGISTER SAVING
By using the “Save_Defaults” register, all the contents of the Write
registers are saved to non-volatile memory. Every time the unit powers on,
these saved registers are loaded.
In case the original factory values are required, a different command code
can be used to recall them.
The command codes are the following:

0x1234: stores current state as default.
 0x5678: restores saved default.
 0x9ABC: restores factory defaults.
After writing a command to the “Save_Defaults” register, this same
register should read 0x1111 to confirm that the previous command was
successfully executed.
4.3.5 MODBUS TIMEOUT
In order to prevent the unit from working in open loop in case of failure of
the process controller or analog/digital communications link, the ASD
master controller can monitor the Modbus activity.
If there is no activity for a given (programmable) time, the unit will
generate a fault and automatically shut down if desired.
To activate this feature, bit “MODBUS TIMEOUT” in the command register
has to be set to “1”. The timeout time is set by the
“Modbus_timeout_period” register.